// support.js

class Container{
  static of (value){
    return new Container(value)
  }

  constructor(value){
    this._value = value
  }

  map (fn) {
    return Container.of(fn(this._value))
  }
}

class Maybe{
  static of(x){
    return new Maybe(x)
  }

  isNothing(){
    return this._value === null || this._value === undefined
  }

  constructor(x) {
    this._value = x
  }

  map(fn){
    return this.isNothing() ? this : Maybe.of(fn(this._value)) 
  }
}


module.exports = {
  Maybe,
  Container
}